Larry Silverstein, the controller of the destroyed WTC complex, stated plainly in a PBS documentary that he and the FDNY decided jointly to demolish WTC 7
late in the afternoon of 9/11. In the documentary "America Rebuilds", aired September 2002, Silverstein makes the following statement;
"I remember getting a call from the, er, fire department commander, telling me that they were not sure they were gonna be able to contain the fire, and I said, 'We've had such terrible loss of life, maybe the smartest thing to do is pull it.' And they made that decision to pull and we watched the building collapse."